package com.hexiang.consumer;

import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.common.protocol.heartbeat.MessageModel;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.io.UnsupportedEncodingException;

@Slf4j
@Component
public class DemoTopicConsumer {

    @Value("${demo.rocketmq.consumer.group}")
    private String consumerGroup;
    @Value("${rocketmq.name-server}")
    private String namesrvAddr;
    @Value("${demo.message.topic}")
    private String topicName;

    private DefaultMQPushConsumer consumer;

    @PostConstruct
    public void init() throws MQClientException {
        consumer = consumerInit();
        consumer.start();
    }

    @PreDestroy
    public void shutdown() {
        consumer.shutdown();
    }

    private DefaultMQPushConsumer consumerInit() throws MQClientException {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(consumerGroup);
        consumer.setNamesrvAddr(namesrvAddr);
        consumer.setMessageModel(MessageModel.CLUSTERING);
        // 消费模式:一个新的订阅组第一次启动从队列的最后位置开始消费 后续再启动接着上次消费的进度开始消费
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_LAST_OFFSET);
        // 订阅主题和 标签（ * 代表所有标签)下信息
        consumer.subscribe(topicName, "*");
        // 注册消费的监听 并在此监听中消费信息, 并返回消费的状态信息
        consumer.registerMessageListener((MessageListenerConcurrently) (msgs, context) -> {
            // msgs 中只收集同一个topic, 同一个 tag, 并且 key 相同的message
            // 会把不同的消息分别放置到不同的队列中
            try {
                for (Message msg : msgs) {
                    // 消费者获取消息 这里只输出 不做后面逻辑处理
                    String body = new String(msg.getBody(), "UTF-8");
                    log.info("  >>> [消费端] 获取消息主题 topic :: {}, 消费消息 body :: {} ", msg.getTopic(), body);
                }
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
                return ConsumeConcurrentlyStatus.RECONSUME_LATER;
            }
            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        });
        return consumer;
    }
}
